Tool-holder stop mechanism.



W. L. SCHELLENBACH.

TOOL HOLDEIR STOP MECHANISM.

APmlcm'mu mad FEB. 23. $9M- Patented July 3, 1917. 4

rilll ll II I lllll Ill! - mission mechanism thereof.

TOOL-HOLDER STOP MECHANISM.

memes.

To all whom it may concern:

Be it lmownthat a citizen of the United States, residing at. Wyoming, inthe county of Hamilton and State of Ohio, certain new and usefulImprovements .in Tool-Holder Stop Mechanism,

following is a specification.

My invent on relatesto improvements in.

tool carriage mechanism for machine tools. One of its objects is toprovide an improved stop mechanism, for the cross feed -'tool holder.Another object is to provide a stop mechanism actuated directly by andfrom the movements of the cross feed tool holder. convenient; means toconnect the stop mechanism with and disconnect itfrom the cross feedscrew. Another object is to provide a cross feed stop mechanism in whichthe stop mechanism is positive and accurate in its action as soon as theContact faces have engaged.

' Another object is to provide a positive stop mechanism in whichfurther tension .ap plied to the cross feed screw after the contactfaces have engaged will not result in "wedging and cramping or bindingthe trans- Another object is to provide aoonvemently arranged,

located and applied stop mechanismi My invention also comprisescertain'details ofv form combination and arrangeriient, all of whichwill. be fully set forth in the'description of the accompanying drawingsin whicl Figure l a plan view, partly in section of a lathe toolcarriage embodying 'my' inwen'tion.

Fig. 2 is a front elevation of 'thesame,

with the hou \ng partly broken away and, vthe feed screw broken to omitthe feed screw handle and one of the clutch members. Fig, 3 is a detailof 5,31% pawlend. ratchet wheels lay means. of which the stops are offected detached.

i3 is an tacked.

The accompanying preferred embodiment plied to a lathe tool holderinwhich A represents the main or longitudinally traveling lathe toolcarriage. B representsthe cross feed an carriage or tool holder mountedto travel in transverse wayson the main carriage A. C represents thecross Trams WILLIAM 1"... SCHELLENBAGH, or wYoMme,

Specification of Letters'latent.

1-, WILLIAM L. I Sommhave invented of which the by means 7 of which it,tion so as to e 1 ratchet wheel,

end elevation of the sameideor knife edges Hand 22 facing in oppositethe'tecth ofuwheels 15 directions to engage of lever 20 is .sup-

drawings represent the of my invention ap- Patented July 3, 1917,;Application filed February 23, 1917. Seria1No.150,404. 1

feed screw rod which is journaledandlhe d against end play in a bearing2 carried y and forming part of the carriageAt H'llie' cross feedcarriage B has anut 3 engaged by the threadedportion of thescrew rod tofeed the carriage'B transversely of the v carriage A on ways 4, in.eitherdirection.

In order to provide a stop mechanism to" limit this feed of the carriageBin each di rection I provide a housing D in front of I the carriageAand in this housing loosely mounted on the screw rod C is a sleeve'5and out of engagement-with'the teeth 6 of. sleeve 5 to connect prdisconnectthe sleeve-' 5 in dr ving relation to the screw rod. The

screw rod C is provided' with a handle-'10 I is manually operated;

)nthe sleeve 5 is a spurgear'll which meshes with a pinion 12 on theshaft 14' journaled in opposite walls of the housing-D, whereby thepinion and shaft 1 are driven at relatively greater speed than the screwrod C. i The shaft l-i carries t-Wo ratchet wheels 15' and 16,preferably with teeth set in opposite directions, or if desired withradially projecting" teeth. A

A lever 20 pivotally supported at-1 7ha' s its shorter end supportedbetween spring actuated plungers '18 seated in recesses 19 In thehousing D to engage opposite sides of lever 20 to normally hold thelever 20 in position along a medial line with its longe." free endocc-upyinga position-intermediate of the ratchet wheels 15 and 16, andin position to be deflected from its normal posingage the teeth ofeither and thereby stop-the rotation 14, and through the. gear 11 ofi'the shaft and pinion 12 to prevent further rotation of.

the screw rod'C. As illustrated insertionin Fig; 3 the free end of lever20 has beveled andlti, and the free end ported to move transverselybetween the ends of supporting screws 24k and25," to prevent the end oflever 20 being bent or -defiected from its normal and'proper position,ltwill thus .be noted that when the lever 20 engages the ratchet teetlrof either normal positions ready. to perform their function again. Alsowhen the lever 20 engages the teeth of one of the ratchet wheels theshaft C is immediately locked against any further movement, exceptthrough breaking of one of the locking members, which provides foraccuracy in the work produced through prompt and effectual stopping ofthe feed.

In order to actuate the lever 20 I provide I a shaft 30 journaled atone-end in a block 31 detachably attached directly to the tool carriageB. I also preferably provide a block of cork or rubber 32 to pressagainst the end of the shaft 30, or equivalent means to prevent theshaft 30 turning too freely in its bearings, and thus being displacedaccidentally or from vibration, from its adjusted positions. Near itsopposite end the shaft 30 is supported in a bearing 33 forming part ofthe housing I). The shaft 30 has a key seat EH along the greater portionof its length and two collars 35 and 36 are mounted upon the shaft 30and held in relative .alinement thereon by means of set screws 42,

the inner ends of which enter the key seat 34 and travel therein topermit the collars to be adjusted endwise on the shaft 30, and

also serve to lock the collars to their ad-- justed positions. A seriesof contact screws 38 say six are threaded through the respective collars35 and 36 so as to occupy posi-' tions equidistant from and parallel toshaft 30, and spaced equidistant from each other. A pair of adjustablecontact screws 40 and 41 are threaded to the lever 20 in axial alinementwith each other and in position to contact with any selected pair ofcontact screws 38 carried by the respective collars 35 and 3G byrotating the shaft 30 to bring the desired pair of contact screws intoalinement with the screws -10 and 4:1. Thus each pair of screws on thecollars may be successively shifted into alinement with screws-4Qai1d 41for use. Should it be necessary to change or reset the tool carried onthetoolcarriage B before the desired' number of duplicate pieces of workhave been produced, it will only be necessary to readjust the contactscrews 40 and 41, instead of requiring readjustment as heretofore of allthe screws carried by the collars 35 and 3G. NVhen not required for usethe shaft 30 may be detached and removed and the clutch member 7disengaged from the teeth 6, and the screw employed in the usual manner.It wil be noted particularly that the shaft 30 is attached to and movesforward and backward. with the 'arriage B, and that the step movement oflever 20 and the ratchet wheels 15 and 16 is positive and instantaneouswithout liability to bind or cramp the locking members.

The mechanism herein illustrated is capable of considerable modificationwithoutdeparting from the principle of my invention. I

Having described my invention what I claim is: i

1. In combination with a hand operated feed screw shaft, a tool holderto be fed in either direction by said feed shaft, a stop memberpositively rotatively driven by said feed shaft, and a stop member. toengage with said rotatively driven stop member, and means toactuate-said last named stop member from and at predetermined positionsof the tool holder.

2. In combination with a hand operated feed screw shaft, a tool holderto be fed in either direction by said feed shaft, :1 toothed wheelpositively driven---in either direction from said feed shaft, a lever toengage said toothed wheel to stop the rotation of said feed shaft, and arotatable shaft provided with a plurality of contact members adjustableinto operative position by rotating said shaft to actuate said lever atpi'mletermined limits of the movement of said tool holder in oppositedirections.

In combination with a hand operated feed screw shaft, a tool holder tobe recipro: cally fed by said shaft, a shaft positively driven at arelatively greater speed from said feed shaft, :1 toothed wheel carriedby said positively driven shaft, and means actuated from and at apredetermined position of said tool holder to engage said, toothed wheelto stop said feed shaft.

4. In combination with a hand operated feed screwv shaft,a tool holderto be reciprocally fed by said shaft, a gear on said screw feed shaft, ashaft provided with a pinion in mesh with said gear, a toothed wheelcarried by said pinion shaft, a lever to engage said toothed wheel tostop the rotation of said feed shaft, and means to actuate said leverata predetermined position of the tool holder.

5. In combination with a hand operated feed screw shaft, a tool-holderto be reciprocally fed by said screw shaft, a rotatable women it heeldriven rt tably by said feed shaft to be engaged by said lever whenact.- ated to stop the rotation of said feed shaft.

6. In'combination with a hand operated feed screw shaft, :1 tool-holderto be reciprocally fed' by said shaft, a rotatable shaft movable endwisewith said tool holder and provided with a plurality of contact membersadjustable into operative position by rotating said tool holder actuatedshaft, a lever to be actuated by engagement with one of said contactmembers at a predetermined position of the tool holder, and a toothedwheel drivenrotatably by said feed shaft to be en -aged by said 'leverwhen actuated to stop the rotation of said feed shaft.

7. In a device of the character disclosed, a tool-holder, a feed screwtherefor, a contact member reciprocally driven by and in unison with themovements of said toolholder, a reciproca-tory stop member actuated byengagement with said contact member, and a rotary stop member drivenfrom and in unison with the movements of said feed screw to inter-engagewith said reciprocatory stop member to lock said feed screw againstrotation at a predetermined position 0 said tool holder.

8. In a device of the character disclosed,

a tool holder, a feed screw therefor, a con tact member reciprocallydriven by and in unison with the movements of said tool holder, and stopmechanism actuated. by

"said contact member to lock said feed screw against rotation at aredetermined position of the tool holder in ependently of the engagementof said screw with the nut of said tool holder.

v9. In combination with the cross feed screw shaft of a machine tool, atool-holder longitiidinally reci rocated by the screw portion of saidfee shaft, a contact member driven by and movable in unison with themovements of said toolholder, and stop mechanism actuated by saidcontact memher to arrest the screw rotation at a predetermined positionof the tool-holder independently of the engagement of said screw withthe nut of said tool holder.

10. A lathe stop feed mechanism, a hand operated feed screw shaft, atool-holder longitudinally adjustable by and on the 'intermediateportion of the screw, a plu' rality of contact members reciprocated byand in unison with the movements of the tool-holder, and stop mechanismactuated by said contact members to interlock the feed screw at apredetermined position of the tool-holder.

11. In a diameter stop, a hand operated screw, a tool-rest engaging saidscrew, a stop member driven from said screw, and means controlled by themovements of said tool-rest to positively stop said screw-driven stopmechanism at predetermined positions.v

12. In a diameter stop, a hand operated screw, a tool, rest reciprocatedby said screw, a ratchet wheel driven by said screw, and adjustablemeans connected to said tool rest to positively arrest the angularmovement of. said ratchet wheel at predetermined positions of said toolrest. v

13, In a diameter stop, a hand operated screw, a tool rest driven fromsaid screw, a toothed wheel positively driven from said screw, and meansintermediate of said tool rest and said toothed wheel to positivelyarrest the an .lar movement of said toothed wheel at pre d e erniinedpositions.

- 14. In a tool holder stop mechanism, a hand operated screw, a toolholder moved by said screw, adjustable means actuated from and by themovement of said tool holder to positively arrest the angular movementof said screw at predetermined positions of said screw. I

In. testimony whereof I afiix my signature in the presence of twowitnesses.

WILLIAM L. SCHELLENBACH.

Witnesses:

C. W. MILES, W. THoRNToN Boer-RT.

